An x-ray diffractometer recorder chart for an element that has either the BCC or the FCC crystal structure showed diffraction peaks at the following 2θ angles: 40.663º, 47.314º, 69.144º, and 83.448º. (The wavelength λ of the incoming radiation was 0.15405 nm.) (a) Determine the crystal structure of the element. (b) Determine the lattice constant of the element. (c) Identify the element.